<div class="code">     
<pre class="verbatim"> 
%%%%%%%%%%%%%%%%%%%%%%%%
%      Donnees
%%%%%%%%%%%%%%%%%%%%%%%%
Iexa = log(2);
alpha = 1;
beta = 2;
N = 4;
h = (beta - alpha)/N;
x = [alpha:h:beta];
f = inline('1/x','x');
%%%%%%%%%%%%%%%%%%%%%%%%
% Corps du programme
%%%%%%%%%%%%%%%%%%%%%%%%
Isi = 0.0;
for i = 1:N
Isi = Isi+h*(1/6*f(x(i))+2/3*f((x(i)+x(i+1))/2)+1/6*f(x(i+1)));
end
%%%%%%%%%%%%%%%%%%%%%%%%%%
% Affichage des resultats
%%%%%%%%%%%%%%%%%%%%%%%%%%
Isi   
Es = abs(Iexa - Isi) 
</pre>
</div> 